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Rigidity of the round cylinders in Ricci shrinkers

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arxiv 2108.03622 v2 pith:U3CCH4XN submitted 2021-08-08 math.DG

classification math.DG
keywords riccicylindersmathbbroundshrinkerstimescloseisometric
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abstract

In this paper, we prove that the round cylinders are rigid in the space of Ricci shrinkers. Namely, any Ricci shrinker that is sufficiently close to $S^{n-1}\times \mathbb R$ in the pointed-Gromov-Hausdorff topology must itself be isometric to $S^{n-1}\times \mathbb R$.

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